Drying cylinder



Efc. @REISEN DRYING CYLINDER Oct, 1s, 1932.

Filed Oct Patented Oct. 18, 1932 ELIJ'AE GREISEN, 0F WAUVIAIOSA, WISCONSIN, ASSIGNOR TO ALLIS-CALFERS MANUFACTURING COMPANY, OF MILWAUKEE, WISCONSIN, A COBPCRATION OF DELA- i y WARE DRYING CYLINDER i n Application filed October 22, 1930. Serial No. 490,411.

l This invention relatesl to improvements in drying cylinders of the type 1n which the drying 'medium, such as heatedv air, is adn `mitted into longitudinally extending internal draft chambers and discharged therefrom into the interior of the cylinder through a longitudinal series of ropenings associated with each of the draft chambers. K'Adrying cylinder of this type has been disclosed, for instance, inthe patent to Cummer, 888,475, May 26, 1,908. f

It is an object of the invention to provide a drying cylinder which is simple and com` pact in construct-ion and efficient in operation. Y

A more particular object of the invention is to provide a drying cylinder of this general character which can be manufactured with a minimum of expense for material as well as labor.

sary to fasten the assembled sheet metal members to the inside of the cylinder. The sheet metal member which forms the trailing wall of the draft chamber is provided with a longitudinal series of gas discharge openings, and means are provided to prevent the material Within the cylinder from Working out through these openings while the cylinder is being rotated. These means are designed, according to the invention, in such a manner that they can be assembled'with the draft chamber Walls outside of the cylinder and do not require any fitting work within the cylinder.

These and other objects and advantages of the invention will be apparent from the following description. A clear conception of an embodiment of the invention and of the operation of a device constructed in accordance therewith, may be had by referring to the drawing accompanying and forminga part of this specification, in which like reference characters designate the same or similar parts in the several views.

Fig. l is a longitudinal sectional elevation Vof a drying apparatus embodying the im'- proved cylinder in working relation.

Fig. 2 is a cross-section of therrcylinder alone.

Fig

ciated therewith. Y

Figs. 4v and 5 are detail views showing a hood for the discharge openings of the draft chambers.

The numeral l designates the drying cylinder as an entirety, which consists of an outersheet metal shell 2 and a plurality of internal draft chambers, in this instance ten, which extendV along the cylinder wall substantially from one end to the other. y vEach draft chamber is confined by the cylinder wall 2 and two sheet metal members 3 and 4, secured to the inner surface of the cylinder in circumferentially spaced relation. The direction in which the cylinder rotates, when in operation, is indicated by the arrows in Figs. 2 and 3, and it will be understood that the wall formed by the member 3 is a trailing wall while the wall formed by the member 4 will be referred toas a leading wall. The-member 4 has a portion bent to an angle of inclination so as to intersect the plane of the trailing wall.I and the member 3 is fastened at its inner end to said inclined portion of the member 4, preferably by welding. An inner portion of the memb'er. 4 is shapedto form a lifting or cascading blade, the end thereof being preferably straight and disposed as shown, so as to retain the material to be dried in a trough while'itv is lifted within the cylinder. y

The drying medium isV admitted to each of the draft chambers through al longitudinal series of circular inlet openings 5 associated with the cylinder wall 2, and a longitudinal series of rectangular outlet openings 6 is profifi 8 is a perspective view showing part y of the cylinder wall and draft chambersv asso-` vided in the trailing wall of each chamber. The inlet openings of the cylinder wall andl the outlet openings of the trailing wall are preferably disposed in staggered relation in order to reduce the chance that material within the cylinder works out through these holes. Moreover, hoods 7 are placed over each of the outlet openings of the trailing wall. Each hood has internal guard ribs 8 and 9 adjacent to the respective outlet opening 6, and er.- ternal lugs having bolt holes registering` with corresponding holes in the trailing wall, Mounting' bolts ll inserted into these holes serve to hold the hoods secured to the trailing wall. The sheet metal members 3 and 4 are secured with their outer ends to the cylinder wall 2 in any suitablD manner, preferably by welding, flanges l2 and i3 projecting laterally from the members 3 and li, respectively, being provided for this purpose.

In operation, products of conilor.` tion heated air are drawn from the furnace lei shown in Fig. l. into the cylinder by a suc tion fan or the like connected to the interior thereof by a pipe line i5 and a cylin l fitting 16. From the upper furnace cl which encloses the drying cylinder the gases are rst admitted to the draft chambers within the cylinder through the holes 5 in the cylinder wall, and from there they pass into the interior ofthe cylinder through the discharge openings 6 in the trailing walls of the draft chambers. l/Vhile the gases circulate in the described manner the cylinder is rotated in the direction indicated in Figs. 2 and 3, by a .suitable mechanism indicated by 17 in Fi It will be seen from Fig. 2 that the material Y accumulating in front of the leading' Walls at the bottom of the cylinder will be retained during the rotation of the cylinder within the troughs foimed bv the inner ends of the sheet metal members t until it reaches aY relatively high elevation within the cylinder, whereby the cascading and drying process is `rendered highly efficient. It will further be seen that the sheet metal inenibers within the cylinder not only provide efficient cascadingy blades but also draft chambers which serve the additional purpose of increasing the longitudinal stability of the cylinder.

The sheet metal members 3 and las well as the hoods 7 may be assembled outside of the cylinder and then fastened as a unit to the cylh inder wall whereby any diiiicult fitting Work within the cylinder is avoided.

The preferred embodiment of the invention herein described is capable of certain modifications without departure from the scope of the invention deiined in the following claims.

It isclaimed and desired to secure by Letters Patent:

l. A drying cylinder comprising a rot-ary continuous -annular shell, boX section niembers forming longitudinally extending inten nal draft chambers associated with said shell and having gas discharge openings in their trailing walls, and means associated with each of said discharge openings to prevent the material within the cylinder from working out f therethrough, said means comprisinga shield member fastened to said trailing walland eX- tending from an inward portion thereof towards said shell, and guard elements estending rearwardly from said trailing wall andv Vand having gas discharge openings in their trailing walls, and means associated with each of said discharge openingsto prevent the material within the cylinder from working out therethrough, said means comprisinga hooded member having an outer wall extending from an inward portion of said trailing wall towards said shell7 side walls adjacent to the respective discharge opening, and in ternal ribs projecting rearwardly from said trailing wall and extending between said side walls. Y

ln testimony whereof7 the signature ofthe inventor is affixed hereto. Y

ELIJAH C. GREISEN. 

